Skills

Problem Solving Java Swift Kotlin Slack Xcode Architecture react node.js C++ JS Gradle Android

Job Specifications

We are excited to be working with a Series B HealthTech scale-up looking to hire a high-calibre contract Senior React Native Engineer into their UK business.

Having already achieved profitability and with hundreds of household-name enterprise clients, they're looking to add fuel to their mobile engineering team fire in the shape of an experienced contract engineer.

This contractor could be based fully-remote anywhere in the UK or hybrid out of their London HQ - the choice is entirely yours.

As Senior React Native Engineer you will work on:

Bridging the Native Gap: You will manage the complex intersection of React Native and native mobile code. This includes debugging mixed builds, writing or maintaining Native Modules, and ensuring seamless interoperability between JS, Swift/Obj-C, and Java/Kotlin/C++.
Architecture & Modernization: You will tackle high-level architectural updates, such as ensuring our Android builds align with modern memory page size requirements (NDK alignment) and managing complex library upgrades against dependency conflicts.
Security & Hardening: As a HealthTech company, trust is everything. You will implement and maintain advanced security features, such as certificate pinning, build protection, and environment integrity checks (e.g., jailbreak/root detection).
Complex Feature Implementation: You will lead the integration of third-party SDKs (such as video conferencing tools) and critical user flows like Multi-Factor Authentication (MFA).
Embedded Collaboration: You will operate as a core member of the team—participating in sprint planning, stand-ups, and demos. You will contribute to code reviews, help unblock peers, and engage in technical discussions in Slack to drive the product forward.

We want to hear from you if you have:

Deep React Native Expertise: You have years of experience not just building screens, but managing the "guts" of the framework. You understand the bridge, the build systems (Gradle/Cocoapods/SPM), and the release pipeline.
Native Fluency: You aren’t afraid to open Xcode or Android Studio. You have experience with native code (Java/Kotlin or Obj-C/Swift) and understand how to troubleshoot issues that originate in the native layer or NDK.
Security Mindset: You understand mobile security best practices and have experience implementing protection layers in a commercial application.
Staff-Augmentation Mindset: You view yourself as part of the team. You are communicative, present, and invested in the quality of the codebase, not just the completion of a contract. If and as opportunities to work on the node.js backend present themselves, you're ready to jump in.
Resilience & Problem Solving: You are unfazed by "red builds." You know how to hunt down obscure build errors, untangle dependency hell, and get the app running smoothly on the latest OS versions.
Drive for Excellence: You take pride in high performance—both in the app (60fps UI) and in your code quality.

Contract details:

Up to £550/day
6 month contract initially
Outside IR35 contract
Fully remote or hybrid working model out of their London HQ - the choice is yours

About the Company

We build elite AI teams in the US, UK & EU for: - Early stage startups (Pre-seed to Series A) - Growth stage scale-ups (Series B to IPO) - Technology ventures on the rise When you’re ready to level-up your GTM, Tech or Ops hiring, drop us an email: hello@talent-co.uk Know more